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车载天线的选择与室外天线

我们:天盛科技产业 來源:媚足 年份:2016/3/22 9:57:52
  网上通迅/在市内时间范围间用业余爱好中继台参与通联,通常情况下还可不可用短小精悍小型的我线,所以市内中干挠相当大,我线很难受干挠,增益控制小点儿对便用中继的功效好大,还是会能使的信号进一步清晰度稳定的,的此外,我线也很难刮到低矮的事物。而主要用于野外车俩之中随时通联则要用相当长的同轴电缆,还可不可提高车俩之中的通迅相距。的此外,需要按照不一的mpv车型来全选同轴电缆,使同轴电缆装设后能和车俩的性能相组织协调,对车辆发挥着装饰品的的功效,为车的颜色提高突出,来说车子先选修长点儿的同轴电缆,来说越野赛车车则还可不可选粗壮狂热点的同轴电缆。

车载天线

  车载天线是指设计安装在车辆上的移动通讯天线,最常见就是吸盘天线。由于(yu)吸(xi)(xi)盘(pan)天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)安装摆放容易,所以(yi)(yi)(yi)在(zai)一(yi)些简易设(she)台场(chang)(chang)合(he)(he)(he)常常用吸(xi)(xi)盘(pan)天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)代(dai)替基地台天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)。车载天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)结构上(shang)有(you)缩短(duan)型(xing)、四(si)分(fen)(fen)(fen)(fen)(fen)之(zhi)(zhi)一(yi)波(bo)(bo)长(zhang)(zhang)(zhang)、中(zhong)部(bu)加(jia)(jia)(jia)(jia)感(gan)型(xing)、八(ba)分(fen)(fen)(fen)(fen)(fen)之(zhi)(zhi)五波(bo)(bo)长(zhang)(zhang)(zhang)、双(shuang)二分(fen)(fen)(fen)(fen)(fen)之(zhi)(zhi)一(yi)波(bo)(bo)长(zhang)(zhang)(zhang)等形(xing)(xing)式的(de)(de)天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian),理论上(shang)它们的(de)(de)效(xiao)率依次增(zeng)加(jia)(jia)(jia)(jia),同样工作(zuo)频(pin)段(duan)的(de)(de)天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)的(de)(de)长(zhang)(zhang)(zhang)度(du)也依次增(zeng)加(jia)(jia)(jia)(jia)。由于(yu)车辆(liang)本身有(you)限高(gao)(gao)(gao),加(jia)(jia)(jia)(jia)上(shang)过(guo)长(zhang)(zhang)(zhang)的(de)(de)天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)在(zai)车辆(liang)高(gao)(gao)(gao)速行进时形(xing)(xing)成的(de)(de)风阻,过(guo)桥洞、进入地下车库都是(shi)问题(ti),所以(yi)(yi)(yi)车载天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)并不(bu)是(shi)越(yue)长(zhang)(zhang)(zhang)越(yue)好,一(yi)般要求(qiu)轿车天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)不(bu)超过(guo)70厘米,面包车类要求(qiu)天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)更短(duan)。缩短(duan)型(xing)天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)体积小巧,虽然增(zeng)益(yi)(yi)不(bu)高(gao)(gao)(gao),但适(shi)合(he)(he)(he)使用于(yu)需要隐(yin)蔽天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)的(de)(de)场(chang)(chang)合(he)(he)(he)。一(yi)般的(de)(de)警用车辆(liang)建(jian)议(yi)安装高(gao)(gao)(gao)增(zeng)天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian),尤其是(shi)在(zai)活动区域范围比较(jiao)(jiao)大(da)(da)的(de)(de)车辆(liang),350MHZ高(gao)(gao)(gao)增(zeng)益(yi)(yi)天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)多分(fen)(fen)(fen)(fen)(fen)为(wei)(wei)八(ba)分(fen)(fen)(fen)(fen)(fen)之(zhi)(zhi)五波(bo)(bo)长(zhang)(zhang)(zhang)加(jia)(jia)(jia)(jia)感(gan)的(de)(de)形(xing)(xing)式,在(zai)距天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)顶部(bu)二分(fen)(fen)(fen)(fen)(fen)之(zhi)(zhi)一(yi)波(bo)(bo)长(zhang)(zhang)(zhang)距离处(chu)有(you)一(yi)个加(jia)(jia)(jia)(jia)感(gan)线(xian)(xian)(xian)(xian)(xian)(xian)圈(quan)。400MHZ频(pin)段(duan)双(shuang)二分(fen)(fen)(fen)(fen)(fen)之(zhi)(zhi)一(yi)波(bo)(bo)长(zhang)(zhang)(zhang)天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)具有(you)较(jiao)(jiao)高(gao)(gao)(gao)的(de)(de)增(zeng)益(yi)(yi),它的(de)(de)外(wai)观特(te)征是(shi)天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)的(de)(de)振子上(shang)有(you)两个加(jia)(jia)(jia)(jia)感(gan)线(xian)(xian)(xian)(xian)(xian)(xian)圈(quan)。八(ba)分(fen)(fen)(fen)(fen)(fen)之(zhi)(zhi)五波(bo)(bo)长(zhang)(zhang)(zhang)天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)和中(zhong)部(bu)加(jia)(jia)(jia)(jia)感(gan)型(xing)天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)也有(you)较(jiao)(jiao)高(gao)(gao)(gao)的(de)(de)增(zeng)益(yi)(yi),且(qie)价格比较(jiao)(jiao)便宜,因此得到广泛的(de)(de)使用。在(zai)作(zuo)为(wei)(wei)临时固定台天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)使用的(de)(de)场(chang)(chang)合(he)(he)(he)可(ke)以(yi)(yi)(yi)考虑选(xuan)(xuan)用增(zeng)益(yi)(yi)高(gao)(gao)(gao)的(de)(de)吸(xi)(xi)盘(pan)天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian),天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)的(de)(de)长(zhang)(zhang)(zhang)度(du)不(bu)必(bi)有(you)过(guo)多限制(zhi)。由于(yu)吸(xi)(xi)盘(pan)天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)是(shi)根据汽车使用环境而设(she)计,所以(yi)(yi)(yi)在(zai)作(zuo)为(wei)(wei)固定使用时在(zai)其下吸(xi)(xi)一(yi)块半(ban)径大(da)(da)于(yu)1米的(de)(de)金属板(如铁皮)会有(you)更好的(de)(de)使用效(xiao)果。由于(yu)进口原装的(de)(de)车载天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)价格非常昂贵且(qie)优势不(bu)突出(chu),所以(yi)(yi)(yi)一(yi)般都选(xuan)(xuan)用国产车载天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)。在(zai)天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)选(xuan)(xuan)型(xing)阶段(duan)主要参考天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)的(de)(de)外(wai)型(xing)和增(zeng)益(yi)(yi)。建(jian)议(yi)选(xuan)(xuan)用大(da)(da)厂(chang)家的(de)(de)名牌产品(pin),他(ta)们提(ti)供(gong)的(de)(de)参数真实性比较(jiao)(jiao)高(gao)(gao)(gao),制(zhi)造工艺(yi)也有(you)保证。如果是(shi)批(pi)量采购完全可(ke)以(yi)(yi)(yi)到专业天(tian)(tian)(tian)线(xian)(xian)(xian)(xian)(xian)(xian)制(zhi)造厂(chang)家按(an)使用频(pin)段(duan)定制(zhi),以(yi)(yi)(yi)取得最(zui)佳(jia)的(de)(de)使用效(xiao)果。

基地台天线

  基地台天线在整个通(tong)讯(xun)(xun)系(xi)统中(zhong)具有(you)(you)非常关键的(de)(de)作用,尤其是(shi)作为通(tong)讯(xun)(xun)枢(shu)纽(niu)的(de)(de)通(tong)信台(tai)站(zhan)。高增(zeng)益天线(xian)不但可以(yi)增(zeng)加无线(xian)电波的(de)(de)覆盖面(mian)积,而且对(dui)接收信号也有(you)(you)一(yi)定(ding)的(de)(de)放大(da)作用,可以(yi)更好的(de)(de)接收微弱(ruo)的(de)(de)上(shang)行信号,改善移动台(tai)与基地(di)台(tai)的(de)(de)无线(xian)通(tong)讯(xun)(xun)质量。一(yi)般情(qing)况下基地(di)台(tai)都选用高增(zeng)益天线(xian),对(dui)于有(you)(you)干扰的(de)(de)情(qing)况可以(yi)按实际(ji)情(qing)况考虑加装窄带滤波器以(yi)减(jian)小(xiao)干扰的(de)(de)影(ying)响。常用的(de)(de)基地(di)台(tai)天线(xian)有(you)(you)玻璃钢天线(xian)、四环阵天线(xian)、定(ding)向天线(xian)。

  玻璃钢天线为全(quan)向天(tian)(tian)线(xian)(xian)基(ji)本(ben)没有(you)方向性,适合基(ji)地(di)台位置位于(yu)通讯(xun)网络中心区域的(de)(de)(de)情(qing)况。由于(yu)玻(bo)(bo)璃(li)(li)钢(gang)天(tian)(tian)线(xian)(xian)安装容易,因此广泛应用(yong)于(yu)各类基(ji)地(di)台站。玻(bo)(bo)璃(li)(li)钢(gang)天(tian)(tian)线(xian)(xian)增(zeng)益(yi)最高(gao)(gao)可以(yi)达到10db左右,增(zeng)益(yi)越高(gao)(gao)天(tian)(tian)线(xian)(xian)也就越长,一般增(zeng)益(yi)为5-6db增(zeng)益(yi)的(de)(de)(de)玻(bo)(bo)璃(li)(li)钢(gang)天(tian)(tian)线(xian)(xian)在(zai)长度和价格上(shang)比较有(you)竞争力,制(zhi)造工艺也比较成熟,采用(yong)较多。该类天(tian)(tian)线(xian)(xian)除了电气性能外,外层玻(bo)(bo)璃(li)(li)钢(gang)天(tian)(tian)线(xian)(xian)罩的(de)(de)(de)品(pin)质(zhi)也有(you)很大的(de)(de)(de)差(cha)异,一些劣质(zhi)产品(pin)在(zai)风吹日晒一年后外层玻(bo)(bo)璃(li)(li)钢(gang)会出现(xian)开裂的(de)(de)(de)情(qing)况导致(zhi)整条天(tian)(tian)线(xian)(xian)报废,一些大厂(chang)名(ming)牌的(de)(de)(de)玻(bo)(bo)璃(li)(li)钢(gang)天(tian)(tian)线(xian)(xian)在(zai)品(pin)质(zhi)上(shang)更有(you)保(bao)障(zhang)。

  定向天线相(xiang)当(dang)(dang)于(yu)把多(duo)个(ge)方(fang)向(xiang)上(shang)的(de)能量集(ji)中到一个(ge)方(fang)向(xiang)上(shang)来发(fa)射,具有主方(fang)向(xiang)辐射增益高(gao)的(de)特点,常用的(de)是八木(mu)天线(xian)(xian)。八木(mu)天线(xian)(xian)的(de)单元(yuan)数越(yue)多(duo)其增益也(ye)越(yue)高(gao),适合点对点远距离(li)通(tong)讯和位于(yu)通(tong)讯网边缘的(de)子(zi)台站使用。比(bi)较适合位于(yu)偏(pian)远地区的(de)派出所(suo)定向(xiang)与上(shang)级分局联系之用,使用得当(dang)(dang)效果(guo)会优于(yu)玻(bo)璃钢天线(xian)(xian)。

  四环阵无线同轴电缆的特征 是经受电机功率大、增加收益值高、增加收益值方法调节式,合适通讯网络枢纽站(支队和市局各种中继台站)的使用,不通过其价位相对较高。四环阵无线同轴电缆两个放射振子方法调节式,当两个振子距离70度安裝时无线同轴电缆形态关键为全向,当两个振子完全安裝在同样方法时无线同轴电缆形态具有着方法性,还在主电磁辐射方法增加收益值加强。巧用其增加收益值方法调节式的形态行最佳的适用非条件精准服务区。若是 四环阵无线同轴电缆的增加收益值欠缺高行考虑到八环阵无线同轴电缆,它的形态与四环阵内似但提高了更高一些的增加收益值。基本350MHZ频段四环阵的增加收益值为8db(全向)10db(专向招生),八环阵的增加收益值为12db(全向)15db专向招生)。